Elevated VE/VCO2 slope predicts higher mortality in hypersensitivity pneumonitis
In patients with hypersensitivity pneumonitis, an elevated VE/VCO2 slope (≥42) was associated with a higher risk of 5-year mortality (HR 3.65; 95% CI 1.04 to 12.80). Restricting analysis to HP patients showed a similar hazard ratio of 5.49 (95% CI 1.19 to 33.54).
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Elevated VE/VCO2 slope predicts higher mortality in hypersensitivity pneumonitis The current body of evidence comprises 1 study. EvidenceHub rates the overall confidence at 34/100 (low).
The Claim
Elevated VE/VCO2 slope predicts higher mortality in hypersensitivity pneumonitis
This conclusion is most relevant to: Patients with hypersensitivity pneumonitis (non-fibrotic and fibrotic) and idiopathic pulmonary fibrosis as comparison group.
What the Research Shows
The conclusion draws on 1 linked study. Highlights from the cited literature:
- ▸Prognostic value of ventilatory efficiency in hypersensitivity pneumonitis. (BMJ open respiratory research, 2026) —
How It Works
The proposed biological pathway:
- ▸VE/VCO2 slope reflects ventilatory efficiency
- ▸Higher VE/VCO2 indicates impaired gas exchange and increased dead space ventilation
- ▸Impaired gas exchange is associated with pulmonary fibrosis and pulmonary hypertension
- ▸Result: Higher mortality risk
Who Might Benefit
Evidence fit by population:
- ▸Patients with hypersensitivity pneumonitis (non-fibrotic and fibrotic) and idiopathic pulmonary fibrosis as comparison group
Recommended Dose
N/A
Limitations & Caveats
Important context when interpreting this evidence:
- ▸Retrospective cohort design limits causal inference
- ▸Small sample size for subgroup analyses (e.g., nfHP n=25)
- ▸Potential selection bias from single-center study
Frequently Asked Questions
What does VE/VCO2 slope measure?▼
VE/VCO2 slope measures ventilatory efficiency during exercise, indicating how much ventilation is needed to eliminate carbon dioxide.
What is the threshold for increased mortality risk?▼
A VE/VCO2 slope of 42 or higher was associated with significantly increased mortality risk in HP patients.
Does this apply to both fibrotic and non-fibrotic HP?▼
The study included both types, but the majority of patients had fibrotic HP (66 out of 91 HP patients), and the predictive value was strongest in fibrotic cases.
How does this compare to IPF?▼
The study included IPF as a comparison group, and similar associations between VE/VCO2 and mortality were observed across both HP and IPF.
References
- 1.Chumpagern W, Spagnolo P, Ratanawatkul P, Mohning MP, Fernández Pérez ER. “Prognostic value of ventilatory efficiency in hypersensitivity pneumonitis..” BMJ open respiratory research, 2026. PMID: 42425739 DOI: 10.1136/bmjresp-2026-004221